Gradle goodness:running Java applications from External Dependency

With Gradle we can execute Java applications using the JavaExec task or the javaexec() method. If we want to run Java code from a external dependency we must first pull in the dependency with the Java application cod E. The best-of-the-to-do-a new dependency configuration. When we configure a task with type JavaExec we can set the classpath to the external dependency. Notice We cannot use the buildscript{} script block to set the classpath. A JavaExec task would fork a new Java process so any classpath settings via is buildscript{} ignored.

In the following example build script we want to execute the Java class from org.apache.cxf.tools.wsdlto.WSDLToJava Apache CXF to generate Java classes fro M a given WSDL. We define a new dependency configuration with the name and use cxf it to assign the CXF dependencies to it. We use the property of the classpath JavaExec task to assign the configuration dependency.

View Sourceprint? 00. // File: build.gradle 01.  02. // Base plugin for task rule clean<task> 03. apply plugin: ‘base‘ 04.  05. repositories.mavenCentral() 06.  07. // New configuration for CXF dependencies. 08. configurations { cxf } 09.  10. ext { 11. // CXF version. 12. cxfVersion = ‘2.6.2‘ 13.  14. // Artifacts for CXF dependency. 15. cxfArtifacts = [ 16. ‘cxf-tools-wsdlto-frontend-jaxws‘ , 17. ‘cxf-tools-wsdlto-databinding-jaxb‘ , 18. ‘cxf-tools-common‘ , 19. ‘cxf-tools-wsdlto-core‘ 20. ] 21. } 22.  23. dependencies { 24. // Assign CXF dependencies to configuration. 25. cxfArtifacts. each { artifact -> 26. cxf "org.apache.cxf:$artifact:$cxfVersion" 27. } 28. } 29.  30. // Custom task to generate Java classes 31. // from WSDL. 32. task wsdl2java(type: JavaExec) { 33. ext { 34. wsdlFile = ‘src/wsdl/service-contract.wsdl‘ 35. outputDir = file( "$buildDir/generated/cxf" ) 36. } 37.  38. inputs.file file(wsdlFile) 39. outputs.dir outputDir 40.  41. // Main Java class to invoke. 42. main = ‘org.apache.cxf.tools.wsdlto.WSDLToJava‘ 43.  44. // Set classpath to dependencies assigned 45. // to the cxf configuration. 46. classpath = configurations.cxf 47.  48. // Arguments to be passed to WSDLToJava. 49. args ‘-d‘ , outputDir 50. args ‘-client‘ 51. args ‘-verbose‘ 52. args ‘-validate‘ 53. args wsdlFile 54. }

Code written with Gradle 1.2

Gradle goodness:running Java applications from External Dependency